Copolyester adhesives

Abstract

Copolyester adhesives are disclosed which are derived from at least 40 mol percent terephthalic acid, up to about 60 mol percent of another dicarboxylic acid selected from isophthalic, succinic, adipic, and glutaric, and a blend of 1,6-hexanediol and diethylene glycol. These copolyesters are useful as adhesives, and especially useful as fusible interlining adhesives.

I claim: 
     
       1. A copolyester of an acid moiety and a glycol moiety, at least 40 mol percent of said acid moiety being a terephthalic acid moiety, said glycol moiety being about 10 to about 90 mol percent of a 1,6-hexanediol moiety and about 90 to about 10 mol percent of a diethylene glycol moiety, said copolyester having a crystalline melting point of about 40°-130° C., a glass transition temperature of about -10° to about 30° C. and a heat of fusion of about 1-10 calories per gram. 
     
     
       2. A copolyester according to claim 1 wherein the crystallization half time is less than about 10 minutes at the maximum crystallization temperature. 
     
     
       3. A copolyester according to claim 1 wherein the terephthalic acid moiety is present in an amount of about 75-85 mol % and about 25-15 mol percent of said acid moiety being selected from moieties of isophthalic, succinic, adipic and glutaric, the 1,6-hexanediol moiety is present in an amount of about 75-85 mol % and the diethylene glycol moiety is present in an amount of about 25-15 mol %. 
     
     
       4. A copolyester according to claim 1 wherein the crystalline melting point is about 80°-115° C. 
     
     
       5. A copolyester according to claim 1 wherein the ΔH f  is greater than about 3.0 calories per gram. 
     
     
       6. A copolyester derived essentially from at least 40 mol percent terephthalic acid, about 10 to about 90 mol percent 1,6-hexanediol and about 90 to about 10 mol percent diethylene glycol, said copolyester having a crystalline melting point of about 80°-115° C., a glass transition temperature of about -10° to about 30° C. and a heat of fusion of at least 3.0 calories per gram. 
     
     
       7. A fusible interlining adhesive comprising a copolyester derived from at least 40 mol percent terephthalic acid, about 10 to about 90 mol percent 1,6-hexanediol and about 90 to about 10 mol percent diethylene glycol, said copolyester having a crystalline melting point of about 40°-130° C., a glass transition temperature of about -10° to about 30° C. and a heat of fusion of about 1-10 calories per gram. 
     
     
       8. A fusible interlining adhesive in powder form comprising the copolyester of claim 7. 
     
     
       9. A fusible interlining adhesive comprising a copolyester derived from at least 40 mol percent terephthalic acid, about 10 to about 90 mol percent 1,6-hexanediol and about 90 to about 10 mol percent diethylene glycol, said copolyester having a crystalline melting point of about 80°-115° C., a glass transition temperature of about -10° to about 30° C. and a heat of fusion of at least 3.0 calories per gram. 
     
     
       10. A fusible interlining adhesive in powder form comprising the copolyester of claim 9.